diff --git a/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp b/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
index 3ee5cd7..cf83f83 100644
--- a/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
+++ b/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
@@ -45,8 +45,12 @@
 const wchar_t kPad = 129;
 const wchar_t kMacro05 = 236;
 const wchar_t kMacro06 = 237;
-const wchar_t kMacro05Header[] = L"[)>05";
-const wchar_t kMacro06Header[] = L"[)>06";
+const wchar_t kMacro05Header[] =
+    L"[)>\036"
+    L"05";
+const wchar_t kMacro06Header[] =
+    L"[)>\036"
+    L"06";
 const wchar_t kMacroTrailer = 0x0004;
 
 wchar_t Randomize253State(wchar_t ch, int32_t codewordPosition) {